Richard Thompson’s back in town, running his second annual Frets and Refrains Acoustic Guitar and Songwriting Camp this week at the Full Moon Resort in Big Indian. The five-day stretch of master classes – taught by RT himself, performing sons Teddy and Jack, fellow British guitar wizard Martin Simpson, Woodstock blues guitar maven Happy Traum, singer/songwriters Sloan Wainwright and Shawn Colvin, along with Simon Tassano, Bobby Eichorn and Zak Hobbs – has been fully booked for many months, alas. But those of us who didn’t sign up in time still get to hear Richard Thompson “and Friends,” including some of his fellow faculty, perform for the adoring masses this Friday night, June 28, at the Bearsville Theater.